OurBits is Chinese private tracker for HD movies , got about 6K torrents & app. 6.6K registered users ( limit of 20K ) . very promising one indeed but needs more users to get into to get more activity.
Maintaing ratio is very easy there , as they got many freeleech torrents & sometimes 2x douple upload ones. also as other chinese trackers got Bonus points system implemented where you can buy Invites / Extra GBs to maintain good standings.